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Rewrite ZipOS

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This reduces the virtual memory usage of Emacs for me by 30%. We now
have a simpler implementation that uses read(), rather mmap()ing the
whole executable.
This commit is contained in:
Justine Tunney 2023-10-03 07:27:25 -07:00
parent ff77f2a6af
commit b01282e23e
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GPG key ID: BE714B4575D6E328
21 changed files with 408 additions and 421 deletions
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21
examples/nesemu1.cc
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@ -12,6 +12,7 @@
#include "dsp/tty/tty.h"
#include "libc/assert.h"
#include "libc/calls/calls.h"
#include "libc/calls/struct/dirent.h"
#include "libc/calls/struct/itimerval.h"
#include "libc/calls/struct/winsize.h"
#include "libc/calls/termios.h"
@ -28,7 +29,6 @@
#include "libc/mem/arraylist2.internal.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/zipos.internal.h"
#include "libc/sock/sock.h"
#include "libc/sock/struct/pollfd.h"
#include "libc/stdio/stdio.h"
@ -1808,19 +1808,12 @@ void GetOpts(int argc, char* argv[]) {
}
size_t FindZipGames(void) {
char* name;
size_t i, cf;
struct Zipos* zipos;
if ((zipos = __zipos_get())) {
for (i = 0, cf = ZIP_CDIR_OFFSET(zipos->cdir);
i < ZIP_CDIR_RECORDS(zipos->cdir);
++i, cf += ZIP_CFILE_HDRSIZE(zipos->map + cf)) {
if (ZIP_CFILE_NAMESIZE(zipos->map + cf) > 4 &&
!memcmp((ZIP_CFILE_NAME(zipos->map + cf) +
ZIP_CFILE_NAMESIZE(zipos->map + cf) - 4),
".nes", 4) &&
(name = xasprintf("/zip/%.*s", ZIP_CFILE_NAMESIZE(zipos->map + cf),
ZIP_CFILE_NAME(zipos->map + cf)))) {
DIR* dir;
if ((dir = opendir("/zip/usr/share/rom"))) {
struct dirent* ent;
while ((ent = readdir(dir))) {
if (endswith(ent->d_name, ".nes")) {
char* name = xasprintf("/zip/usr/share/rom/%s", ent->d_name);
APPEND(&zipgames_.p, &zipgames_.i, &zipgames_.n, &name);
}
}